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Not a stupid post; tinkering with Nissan diffs can be problematic at times. You might have the R200 from another Nissan, but we'll need pictures of the diff, shafts, and ideally a comparison of the shafts/diff to factory gear (I assume you have a replacement diff).

Personally, I would just get a replacement S14 non-abs diff and shafts, or ideally a 5-bolt S13/Skyline diff+shafts and then swap the rear housing. You can likely swap the bearing housings between 6-bolt shafts (unless they have differences between models), but you can't swap 5-bolt axle parts onto 6-bolt axle parts, as the 5-bolt shafts are thicker including the splines, and they use 5 spider bearings instead of 3.

Replacing both the diff and shafts with a matching set is definitely the least rage-inducing option.

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Not a stupid post; tinkering with Nissan diffs can be problematic at times. You might have the R200 from another Nissan, but we'll need pictures of the diff, shafts, and ideally a comparison of the shafts/diff to factory gear (I assume you have a replacement diff).

Personally, I would just get a replacement S14 non-abs diff and shafts, or ideally a 5-bolt S13/Skyline diff+shafts and then swap the rear housing. You can likely swap the bearing housings between 6-bolt shafts (unless they have differences between models), but you can't swap 5-bolt axle parts onto 6-bolt axle parts, as the 5-bolt shafts are thicker including the splines, and they use 5 spider bearings instead of 3.

Replacing both the diff and shafts with a matching set is definitely the least rage-inducing option.

If you're swapping the housing on the shafts, the spider gear assembly is supposed to go with it as a matching set. The shafts are balanced so the whole assembly needs to be marked before teardown do it can be reassembled in the same configuration.

There are 3 (oem) different spider gear assemblies used in the 6 bolt (3×2) cv joints, they're stamped 00, 01, or 02. Taarks sells these for $100 each, Nissan was close to three times that. Most s14 will be 00 or 01, but I've seen some that had no stamp which i assume was aftermarket.

I've mixed up spider gear assemblies with non-matching housings with apparent success, but the stamped numbers matched the housing in that case.

I would buy an r200 vlsd from a s14 in 3.69 or 3.92, above that would get annoying for a daily when it comes to cruising highway speeds.

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I don't know, but it is definitely a 4.11 and not a conventional silvia r200.

Z32, gtr or something.

Ps. Your drive shafts are leaking. If you're reusing those shafts pop the end plates off, remove the housing and clean the old oily grease out. Replace with new cv grease and replace boots if necessary.

Clean the end plate and add a touch of silicon sealer around the rim (not really necessary but means you're less likely to have leaks and won't need to pull them out again).